CN103091535A - Proximity current sensing device and method - Google Patents

Abstract

A proximity current sensing device and method includes a body, a first adjusting element, a second adjusting element, a first sensing unit, a second sensing unit, a third sensing unit and a processing unit. The body has an opening adapted for a wire to pass through the body. The first and second adjusting elements are respectively arranged on the first side and the second side of the body and used for adjusting the first position and the second position of the lead. The first, second and third sensing units are respectively disposed on the body and adjacent to the first, second and third sides of the conductive wire for sensing the first, second and third magnetic fluxes of the conductive wire. The processing unit rotates the adjusting element to ensure that the third sensing unit is positioned above the center point of the conducting wire according to the first magnetic flux and the second magnetic flux, estimates the installation position according to the third magnetic flux and calculates the current amount.

Description

Proximity current sensing device and method

technical field

A current sensor, in particular to a proximity current sensing device.

Background technique

In recent years, with the rapid development of industrial automation, the demand for high-reliability and high-performance control instruments is increasing. Various sensors play an absolutely important role in the monitoring function of automation, among which current sensors are an indispensable part in industrial or home automation industries such as instrument detection and control.

At present, current sensors can be divided into four categories according to the principle, such as 1. Ohm's law--resistive shunt type, 2. Faraday's law of induction--CT converter, 3. Magnetic field sensing--Hall element and 4. Faraday Photoelectric effect - fiber optic current sensor. The former two are either directly measured or bulky and heavy in use, so they are inconvenient. The Hall element has attracted special attention because of its small size, light weight, and proximity measurement. However, due to the difficulty in maintenance and the complicated structure of the fiber optic current sensor, the scope of application is relatively small.

According to Ampere's principle, when a current passes through a conductor, a magnetic field will be formed around it, and its magnitude is proportional to the current of the conductor and inversely proportional to the distance between them. Therefore, by detecting the magnitude of the magnetic field, the magnitude of the current passing through the conductor can be known. However, most of the current proximity current sensors have the problem of excessive measurement error due to the installation position, which causes inconvenience in use. Therefore, there is still room for improvement in the proximity current sensors.

Contents of the invention

In view of the above problems, the present invention is to provide a proximity current sensing device and method, so as to accurately correct the position of the wire and reduce the current measurement error.

A proximity current sensing device of the present invention includes a body, a first adjusting element, a second adjusting element, a first sensing unit, a second sensing unit, a third sensing unit and a processing unit. The body has an opening, and the opening is suitable for a wire to pass through the body. The first adjusting element is arranged on the first side of the body, and is used for adjusting the first position of the wire. The second adjusting element is arranged on the second side of the body, and is used for adjusting the second position of the wire. The first sensing unit is disposed on the body and adjacent to the first side of the wire for sensing the first magnetic flux of the wire. The second sensing unit is disposed on the body and adjacent to the second side of the wire for sensing the second magnetic flux of the wire. The third sensing unit is disposed on the body and adjacent to the third side of the wire for sensing the third magnetic flux of the wire. The processing unit is coupled to the first sensing unit, the second sensing unit and the third sensing unit for determining the position of the wire according to the first magnetic flux and the second magnetic flux, and calculating the current amount according to the third magnetic flux.

A proximity current sensing method of the present invention includes the following steps. The first magnetic flux of the wire is sensed by the first sensing unit, wherein the first sensing unit is adjacent to the first side of the wire. The second magnetic flux of the wire is sensed by the second sensing unit, wherein the second sensing unit is adjacent to the second side of the wire. The third sensing unit is used to sense the third magnetic flux of the wire, wherein the third sensing unit is adjacent to the third side of the wire. The position of the wire is calculated according to the first magnetic flux and the second magnetic flux. The current amount is calculated according to the third magnetic flux.

A proximity current sensing device and method of the present invention, which senses the magnetic flux of the wire through the sensing unit (the first sensing unit and the second sensing unit) to determine whether the position of the wire is located in the body of the current sensing device position in the builtin. If not, use the adjustment elements (first adjustment element and second adjustment element) to adjust the position of the wire, so that the wire is located in the built-in position of the device body, and then sense the magnetic flux of the wire through the third sensing unit to calculate the current flow. The amount of current flowing through the wire. In this way, the error of current measurement can be effectively reduced.

Description of drawings

FIG. 1 is a schematic diagram of a proximity current sensing device of the present invention.

FIG. 2 is a schematic diagram of the arrangement relationship of the sensing units 140 , 150 , 160 of the present invention.

FIG. 3 is a circuit block diagram of the proximity current sensor of the present invention.

FIG. 4 is a schematic diagram of another proximity current sensing device of the present invention.

FIG. 5 is a schematic configuration diagram of the sensing units 462 , 464 , 466 , 468 of the present invention.

FIG. 6 is a circuit block diagram of another proximity current sensing device of the present invention.

FIG. 7 is a flow chart of the proximity current sensing method of the present invention.

FIG. 8 is a flowchart of another proximity current sensing method of the present invention.

Description of main component symbols

100, 400 Proximity current sensing device

110, 410 body

111, 411 opening

112, 412 wire

120, 130, 420, 430, 440, 450 Adjustment elements

121, 131, 421, 431, 441, 451 Ejector

122, 132, 422, 432, 442, 452 Knobs

140, 150, 160, 462, 464, 466, 468 sensing units

170, 470 processing unit

180, 480 display unit

210, 220 sensing coil

310, 610, 620 comparison unit

320, 630 computing units.

Detailed ways

The features and implementation of the present invention will be described in detail as follows with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a block diagram of the proximity current sensing device of the present invention. The proximity current sensing device 100 includes a main body 110 , adjustment elements 120 , 130 , sensing units 140 , 150 , 160 , a processing unit 170 and a display unit 180 . The body 110 has an opening 111 . The opening 111 is suitable for the wire 112 to pass through the body 110 . That is to say, the user can pass the wire 112 through the body 110 through the opening 111 to measure the current of the wire 112 . In this embodiment, the wire 112 is a double-core power wire.

The adjustment element 120 is disposed on the first side of the body 110 for adjusting the first position of the wire 112 . The adjusting element 130 is disposed on the second side of the body 110 for adjusting the second position of the wire 112 . In this embodiment, the adjustment element 120 may include a push rod 121 and a knob 122 . The knob 122 is connected to the push rod 121 , and the rotation of the knob 122 drives the push rod 121 to generate a reciprocating motion, so that the push rod 121 penetrates or exits the body 110 .

In addition, the adjustment element 130 includes a push rod 131 and a knob 132 . The knob 132 is connected to the push rod 131 , and the rotation of the knob 132 drives the push rod 131 to generate a reciprocating motion, so that the push rod 131 penetrates or exits the body 110 . In this way, the user can rotate the knob 122 or 132 to make the wire 112 move left or right in a horizontal manner, and then adjust the wire 112 to a position inside the body 110 to control the current flow of the wire 112 measurement.

The sensing unit 140 is disposed on the body 110 and adjacent to the first side of the wire 112 for sensing a first magnetic flux of the wire 112 . If the wire 112 is closer to the sensing unit 140 , the first magnetic flux sensed by the sensing unit 140 is larger. On the contrary, if the wire 112 is farther away from the sensing unit 140 , the first magnetic flux sensed by the sensing unit 140 is smaller.

The sensing unit 150 is disposed on the body 110 and adjacent to the second side of the wire 112 for sensing the second magnetic flux of the wire 112 . If the wire 112 is closer to the sensing element 150 , the second magnetic flux sensed by the sensing unit 150 is larger. On the contrary, if the wire 112 is farther away from the sensing unit 150 , the second magnetic flux sensed by the sensing unit 150 is smaller.

The sensing unit 160 is disposed on the body 110 and adjacent to the third side of the wire 112 for sensing a third magnetic flux of the wire 112 . The processing unit 170 is coupled to the sensing units 140 , 150 and 160 for determining the position of the wire 112 according to the first magnetic flux and the second magnetic flux, and calculating the current flowing through the wire 112 according to the third magnetic flux. In addition, the processing unit 170 can further estimate the installation position of the wire 112 according to the third magnetic flux, that is, the distance between the wire 112 and the sensing unit 160 . The display unit 180 is coupled to the processing unit 170 for displaying the position of the wire 112 and the amount of current flowing through the wire 112 .

In this way, the user can know the deviation of the position of the wire 112 through the position of the wire 112 displayed on the display unit 180, and then observe whether the sensor 160 is indeed located above the center of the wire 112, that is, whether the wire 112 is located at the center of the wire 112. The position where the main body 110 is built. Then, the adjustment units 120 and 130 are used to adjust the position of the wire 112 to ensure that the sensor 160 is located above the center of the wire 112 , thereby reducing errors in current measurement.

Please refer to FIG. 2 , which is a schematic diagram of the configuration relationship of the sensing units 140 , 150 and 160 of the present invention. Wherein, the sensing units 140 and 150 may be sensing coils respectively. The sensing unit 160 further includes sensing coils 210 and 220 . The sensing coil 210 is disposed on the body 110 and adjacent to the third side of the wire 112 . The sensing coil 220 is disposed on the body 110 and adjacent to the sensing coil 210 with a predetermined distance d. In this embodiment, the preset distance d is a known fixed distance.

According to Ampere's law, a current flowing through a long straight wire will generate a circular magnetic field in its adjacent space. Sensing the current on the wire 112 through the sensing unit 160 of this embodiment can obtain a sensing voltage according to Faraday's law of induction

$\mathrm{emf}\left(v\right)=-\underset{\mathrm{no}=1}{\overset{N}{\mathrm{\Σ}}}\frac{d{\mathrm{\Φ}}_{\mathrm{no}}}{\mathrm{dt}}=\frac{{\mathrm{\ω\μ}}_{0}I\sin \mathrm{\ωt}}{2\mathrm{\π}}\underset{\mathrm{no}=1}{\overset{N}{\mathrm{\Σ}}}{c}_{\mathrm{no}}\ln \left(\frac{{b_{\mathrm{no}}}^2+g^2}{{a_{\mathrm{no}}}^2+g^2}\right),$ in

${\mathrm{<span\; class="notranslate">\; \&Phi;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; \&Integral;</span>\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; d</span>}\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; I</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&omega;t</span>}}{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}{<span\; class="notranslate">\; \&Integral;</span>}_{{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; g</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}\mathrm{<span\; class="notranslate">\; dx</span>}$

${\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; ,</span>$

${\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; w</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; ]</span>$

c _n ＝L-2n·w _d -2(n-1)·w _s

w _c is the line width of the induction coils 210, 220, w _d is the line width of the winding wires of the induction coils 210, 220, w _s is the line distance between the winding wires of the induction coils 210, 220, μ ₀ is the magnetic permeability, I is the current on the wire 112 , g is the distance between the induction coil 210 and the wire 112 , and N is the coil number of the induction coil 210 , 220 . Moreover, by sensing the current on the wire 112 through the induction coils 210 and 220 of this embodiment, the induced voltage that can be obtained is as follows:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;\&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; I</span>}\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&omega;t</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}\mathrm{<span\; class="notranslate">\; ln</span>}<span\; class="notranslate">\; (</span>\frac{{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; g</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; g</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>\\ {\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;\&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; I</span>}\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&omega;t</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}\mathrm{<span\; class="notranslate">\; ln</span>}<span\; class="notranslate">\; (</span>\frac{{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>\end{array}\right.$

Among them, the parameters a _n , b _n , c _n , N, d, etc. are all known parameters, while I and g are unknowns, V ₁ is the voltage sensed by the induction coil 210 , and V ₂ is the voltage sensed by the induction coil 220 . Therefore, the parameters of I and g can be obtained through the above two equations, so that the proximity current sensing device 100 of this embodiment can accurately sense the current amount of the wire 112 and the installation position of the wire 112 (that is, the distance between the wire 112 and the sensor). measuring unit 160).

Please refer to FIG. 3 , which is a circuit block diagram of the proximity current sensing device of the present invention. The proximity current sensing device 100 includes sensing units 140 , 150 , 160 , a processing unit 170 , and a display unit 180 , and the coupling relationship thereof is shown in FIG. 3 , so details are not repeated here. Wherein, the processing unit 170 includes a comparison unit 310 and a calculation unit 320 . The comparison unit 310 is coupled to the sensing units 140 and 150 for receiving and comparing the first magnetic flux and the second magnetic flux to generate a first comparison result. The calculation unit 320 is coupled to the comparison unit 310 and the sensing unit 160 for determining the position of the wire 112 according to the first comparison result, and calculating the current flowing through the wire 112 according to the third magnetic flux.

For example, when the first magnetic flux is greater than the second magnetic flux, and the first comparison result output by the comparison unit 310 is, for example, positive, then the calculation unit 320 will determine that the position of the wire 112 is closer to the sensing unit 140, and display it on the display unit 180 on display. When the first magnetic flux is smaller than the second magnetic flux, the first comparison result output by the comparison unit 310 is negative, and the calculation unit 320 determines that the position of the wire 112 is closer to the sensing unit 150 and displays it on the display unit 180 . When the first magnetic flux is equal to the second magnetic flux, the first comparison result output by the comparison unit 310 is, for example, zero, and the calculation unit 320 will calculate that the position of the wire 112 is located between the sensing units 140 and 150, that is, located inside the main body 110. The location is displayed on the display unit 180.

The operation of the proximity current sensing device 100 will be further described below. First, the user can pass the wire 112 through the body 110 through the opening 111 . Then, the first magnetic flux and the second magnetic flux of the wire 112 are sensed by the inductive elements 140 and 150 , and the processing unit 170 determines the position of the wire 112 accordingly, and displays it on the display unit 180 . If the wire 112 is closer to the sensing unit 140 , the user can adjust the wire 112 to the left through the adjustment unit 120 so that the wire 112 is far away from the sensing unit 140 and close to the sensing unit 150 . If the wire 112 is closer to the sensing unit 150 , the user can adjust the wire 112 to the right through the adjustment unit 130 so that the wire 112 is far away from the sensing unit 150 and close to the sensing unit 140 . Through the above-mentioned adjustments, the position of the wire 112 is located in the built-in position of the main body 110 .

At this time, the sensing unit 160 senses the third magnetic flux of the wire 112 , and the processing unit 170 calculates the third magnetic flux according to Faraday's law to obtain the current flowing through the wire 112 . In this way, the current on the wire 112 can be accurately measured, thereby reducing errors in current measurement.

The above description is an implementation example of the present invention, and another example will be given below for illustration. Please refer to FIG. 4 , which is a block diagram of the proximity current sensing device of the present invention. The proximity current sensing device 400 includes a body 410 , adjustment elements 420 , 430 , 440 , 450 , sensing units 462 , 464 , 466 , 468 , a processing unit 470 and a display unit 480 .

The body 410 has an opening 411 . The opening 411 is suitable for the wire 412 to pass through the body 410 . That is to say, the user can pass the wire 412 through the body 410 through the opening 411 to measure the current of the wire 412 . In this embodiment, the wire 412 is a double-core power wire.

The adjustment element 420 is disposed on the first side of the body 410 for adjusting the first position of the wire 412 . The adjusting element 430 is disposed on the second side of the body 410 for adjusting the second position of the wire 412 . In this embodiment, the adjustment element 420 may include a push rod 421 and a knob 422 . The knob 422 is connected to the push rod 421 , and the rotation of the knob 422 drives the push rod 421 to generate a reciprocating motion, so that the push rod 421 penetrates or exits the body 410 .

In addition, the adjustment element 430 includes a push rod 431 and a knob 432 . The knob 432 is connected to the push rod 431 , and the rotation of the knob 432 drives the push rod 431 to generate a reciprocating motion, so that the push rod 431 penetrates or exits the body 410 . The operation of the adjustment units 420 and 430 can refer to the implementation of the adjustment units 120 and 130 in FIG. 1 , so it will not be repeated here.

The adjusting element 440 is disposed on the third side of the body 410 for adjusting the third position of the wire 412 . The adjusting element 450 is disposed on the fourth side of the body 410 for adjusting the fourth position of the wire 412 . In this embodiment, the adjustment element 440 may include a push rod 441 and a knob 442 . The knob 442 is connected to the push rod 441 , and the rotation of the knob 442 drives the push rod 441 to generate a reciprocating motion, so that the push rod 441 penetrates or exits the body 410 .

In addition, the adjustment element 450 includes a push rod 451 and a knob 452 . The knob 452 is connected to the push rod 451 , and the rotation of the knob 452 drives the push rod 451 to generate a reciprocating motion, so that the push rod 451 penetrates or exits the body 410 . In this way, the user can rotate the knob 442 or 452 to make the wire 412 move up or down in a vertical manner, and then adjust the wire 412 to a position inside the body 410 to adjust the amount of current of the wire 412 Measure.

The sensing unit 462 is disposed on the body 410 and adjacent to the first side of the wire 412 for sensing the first magnetic flux of the wire 412 . If the wire 412 is closer to the sensing unit 462 , the first magnetic flux sensed by the sensing unit 462 is larger. Conversely, if the wire 412 is farther away from the sensing unit 462 , the first magnetic flux sensed by the sensing unit 462 is smaller.

The sensing unit 464 is disposed on the body 410 and adjacent to the second side of the wire 412 for sensing the second magnetic flux of the wire 412 . If the wire 412 is closer to the sensing unit 464 , the second magnetic flux sensed by the sensing unit 464 is larger. On the contrary, if the wire 412 is farther away from the sensing unit 464 , the second magnetic flux sensed by the sensing unit 464 is smaller.

The sensing unit 466 is disposed on the body 410 and adjacent to the third side of the wire 412 for sensing the third magnetic flux of the wire 412 . If the wire 412 is closer to the sensing unit 466 , the third magnetic flux sensed by the sensing unit 466 is larger. On the contrary, if the wire 412 is farther away from the sensing unit 466 , the third magnetic flux sensed by the sensing unit 466 is smaller.

The sensing unit 468 is disposed on the body 410 and adjacent to the fourth side of the wire 412 for sensing the fourth magnetic flux of the wire. If the wire 412 is closer to the sensing unit 468 , the third magnetic flux sensed by the sensing unit 468 is larger. Conversely, if the wire 412 is farther away from the sensing unit 468 , the third magnetic flux sensed by the sensing unit 468 is smaller.

The processing unit 470 is coupled to the sensing units 462, 464, 466, and 468, and is used to determine a position (such as a position in the horizontal direction) of the wire 412 according to the first magnetic flux and the second magnetic flux, and to determine a position (such as a position in the horizontal direction) of the wire 412 according to the third magnetic flux and the fourth magnetic flux. The magnetic flux is used to determine another position of the wire 412 (for example, the position in the vertical direction), and the amount of current flowing through the wire 412 is calculated according to the third magnetic flux.

In this way, the user can know the deviation of the position of the wire 112 through the position of the wire 112 displayed on the display unit 480 (ie, the position in the horizontal direction) and another position (ie, the position in the vertical direction). Then, the position of the wire 112 is adjusted by using the adjustment units 420 , 430 , 440 and 450 to ensure that the wire 112 is located in the built-in position of the body 410 , thereby reducing errors in current measurement.

Please refer to FIG. 5 , which is a schematic diagram of the configuration relationship of the sensing units 462 , 464 , 466 and 468 of the present invention. Wherein, the sensing units 462 , 464 , 466 and 468 may be sensing coils respectively. Since the wire 412 is located in the built-in position of the main body 410, the distance g between the induction coil 466 and the wire 412 is 1/2 of the height of the main body 410, so the current on the wire 412 is sensed by the sensing unit 466 of this embodiment, The induced voltages that can be obtained are as follows:

$\mathrm{<span\; class="notranslate">\; emf</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; v</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\frac{{\mathrm{<span\; class="notranslate">\; d\&Phi;</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&omega;\&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; I</span>}\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&omega;t</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\underset{\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}\mathrm{<span\; class="notranslate">\; ln</span>}<span\; class="notranslate">\; (</span>\frac{{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; g</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; g</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span>$

Among them, the parameters a _n , b _n , c _n , N, g, etc. are all known parameters, and I is an unknown number. Therefore, the parameter I can be obtained through the above equation, so that the proximity current sensing device 400 of this embodiment can accurately sense the current of the wire 412 .

Please refer to FIG. 6 , which is a circuit block diagram of another proximity current sensing device of the present invention. The proximity current sensing device 400 includes sensing units 462 , 464 , 466 , 468 , a processing unit 470 , and a display unit 480 , and the coupling relationship thereof is referred to FIG. 6 , so details are not repeated here. Wherein, the processing unit 470 includes comparison units 610 , 620 and a calculation unit 630 . The comparison unit 610 is coupled to the sensing units 462 and 464 for receiving and comparing the first magnetic flux and the second magnetic flux to generate a second comparison result. The comparison unit 620 is coupled to the sensing unit 466 and the sensing unit 468 for receiving and comparing the third magnetic flux and the fourth magnetic flux to generate a third comparison result. The calculation unit 630 is coupled to the comparison units 610, 620 and the sensing unit 466, and is used to determine the position of the wire 412 according to the second comparison result, determine another position of the wire 412 according to the third comparison result, and determine the position of the wire 412 according to the third comparison result, and determine the position of the wire 412 according to the third magnetic flux. , calculate the amount of current flowing through the wire 412 .

For example, when the first magnetic flux is greater than the second magnetic flux, and the second comparison result output by the comparison unit 610 is, for example, positive, then the calculation unit 630 will determine that the position of the wire 412 is closer to the sensing unit 462, and display it on the display unit 480 on display. When the first magnetic flux is smaller than the second magnetic flux, the second comparison result output by the comparison unit 610 is eg negative, and the calculation unit 630 determines that the position of the wire 412 is closer to the sensing unit 464 and displays it on the display unit 480 . When the first magnetic flux is equal to the second magnetic flux, the second comparison result output by the comparison unit 610 is, for example, zero, and the calculation unit 630 will judge that the position of the wire 412 is between the sensing units 462 and 464, that is, at the level inside the body 410 centered position and displayed on the display unit 480 .

When the third magnetic flux is greater than the fourth magnetic flux, the third comparison result output by the comparison unit 620 is, for example, positive, and the calculation unit 630 determines that the position of the wire 412 is closer to the sensing unit 466 and displays it on the display unit 480 . When the third magnetic flux is smaller than the fourth magnetic flux, the third comparison result output by the comparison unit 620 is eg negative, and the calculation unit 630 determines that the position of the wire 412 is closer to the sensing unit 468 and displays it on the display unit 480 . When the third magnetic flux is equal to the fourth magnetic flux, the third comparison result output by the comparison unit 620 is, for example, zero, and the calculation unit 630 will judge that the position of the wire 412 is between the sensing units 466 and 468, that is, it is vertically located in the body 410 centered position and displayed on the display unit 480 .

The operation of the proximity current sensing device 400 will be further described below. First, the user can pass the wire 412 through the body 410 through the opening 411 . Then, the first magnetic flux and the second magnetic flux of the wire 412 are sensed by the sensing elements 462 and 464, and the third magnetic flux and the fourth magnetic flux of the wire 412 are sensed by the sensing units 466 and 468, and the processing unit 470 judges the wire accordingly. 412 and displayed on the display unit 480. If the wire 412 is closer to the sensing unit 462 , the user can adjust the wire 412 to the left through the adjustment unit 420 so that the wire 412 is far away from the sensing unit 462 and close to the sensing unit 464 . If the wire 412 is closer to the sensing unit 464 , the user can adjust the wire 412 to the right through the adjusting unit 430 so that the wire 412 is far away from the sensing unit 464 and close to the sensing unit 462 . Through the above adjustments, the position of the wire 412 is located at a horizontally centered position in the body 410 .

In addition, if the wire 412 is closer to the sensing unit 466 , the user can adjust the wire 412 to the left through the adjusting unit 440 so that the wire 412 is far away from the sensing unit 466 and close to the sensing unit 468 . If the position of the wire 412 is closer to the sensing unit 468 , the user can adjust the wire 412 to the right through the adjusting unit 450 so that the wire 412 is away from the sensing unit 468 and close to the sensing unit 466 . Through the above adjustments, the position of the wire 412 is vertically centered in the body 410 .

At this time, the sensing unit 466 senses the third magnetic flux of the wire 412 , and the processing unit 470 calculates the third magnetic flux according to Faraday's law to obtain the current flowing through the wire 412 . In this way, the current on the wire 412 can be accurately measured, thereby reducing errors in current measurement.

Through the description of the implementation in FIG. 1 , a proximity current sensing method can be summarized. Please refer to FIG. 7 , which is a flowchart of the proximity current sensing method of the present invention. In step S710, a first sensing unit is used to sense a first magnetic flux of the wire, wherein the first sensing unit is adjacent to a first side of the wire. In step S720, the second magnetic flux of the wire is sensed by the second sensing unit, wherein the second sensing unit is adjacent to the second side of the wire. In step S730, a third magnetic flux of the wire is sensed by a third sensing unit, wherein the third sensing unit is adjacent to a third side of the wire. In step S740, the position of the wire is determined according to the first magnetic flux and the second magnetic flux. In step S750, the current amount is calculated according to the third magnetic flux. In step S760, the position and current flow of the wire are displayed. In this way, the user can know the deviation of the wire in the main body by displaying the position of the wire (for example, the position in the horizontal direction).

The aforementioned step S740 further includes the following steps. The first magnetic flux is compared with the second magnetic flux to generate a first comparison result. Then, according to the first comparison result, the position of the wire is determined.

Through the description of the implementation in FIG. 4 , a proximity current sensing method can be summarized. Please refer to FIG. 8 , which is a flowchart of the proximity current sensing method of the present invention. In step S810 , a first sensing unit is used to sense a first magnetic flux of the wire, wherein the first sensing unit is adjacent to a first side of the wire. In step S820, the second magnetic flux of the wire is sensed by the second sensing unit, wherein the second sensing unit is adjacent to the second side of the wire. In step S830, a third magnetic flux of the wire is sensed by a third sensing unit, wherein the third sensing unit is adjacent to a third side of the wire. In step S840, the position of the wire is determined according to the first magnetic flux and the second magnetic flux.

In step S850, the fourth sensing unit is used to sense the fourth magnetic flux of the wire, wherein the fourth sensing unit is adjacent to a fourth side of the wire. In step S860, another position of the wire is determined according to the third magnetic flux and the fourth magnetic flux. In step S870, the current amount is calculated according to the third magnetic flux. In step S880, the position of the wire, another position and the amount of current are displayed. In this way, the user can know the deviation of the wire in the main body by displaying the position of the wire (such as the position in the horizontal direction) and another position (such as the position in the vertical direction).

The aforementioned step S840 further includes the following steps. The first magnetic flux is compared with the second magnetic flux to generate a second comparison result. Then, according to the second comparison result, the position of the wire is determined. The aforementioned step S860 further includes the following steps. The third magnetic flux is compared with the fourth magnetic flux to generate a third comparison result. According to the third comparison result, another position of the wire is determined.

In the proximity current sensing device and method of the embodiments of the present invention, the magnetic flux of the wire is sensed by the sensing unit (the first sensing unit and the second sensing unit; the first to the fourth sensing unit) to determine Whether the position of the wire is located in the built-in position of the current sensing device body. If not, adjust the position of the wire by using the adjustment elements (the first adjustment element and the second adjustment element; the first to the fourth adjustment elements), so that the wire is located in the built-in position of the device body, and then sensed by the third sensing unit The magnetic flux of a wire to calculate the amount of current flowing through it. In this way, the error of current measurement can be effectively reduced.

Claims (17)

1. A proximity current sensing device, comprising: a body having an opening adapted for a lead to pass through the body; a first adjusting element, configured on a first side of the body, for adjusting a first position of the wire; a second adjusting element, arranged on a second side of the body, for adjusting a second position of the wire; a first sensing unit, disposed on the body and adjacent to a first side of the wire, for sensing a first magnetic flux of the wire; a second sensing unit, disposed on the body and adjacent to a second side of the wire, for sensing a second magnetic flux of the wire; a third sensing unit, disposed on the body and adjacent to a third side of the wire, for sensing a third magnetic flux of the wire; and A processing unit, coupled to the first sensing unit, the second sensing unit, and the third sensing unit, is used to determine the position of the wire according to the first magnetic flux and the second magnetic flux, and to determine the position of the wire according to the The third magnetic flux calculates an electric current. 2. The proximity current sensing device according to claim 1, wherein the third sensing unit comprises: a first sensing coil disposed on the body and adjacent to the third side of the wire; and A second sensing coil is disposed on the body and adjacent to the first sensing coil with a predetermined distance. 3. The proximity current sensing device according to claim 1, wherein the processing unit comprises: a first comparison unit, coupled to the first sensing unit and the second sensing unit, for receiving and comparing the first magnetic flux and the second magnetic flux to generate a first comparison result; and A first calculation unit, coupled to the first comparison unit and the third sensing unit, is used for judging the position of the wire according to the first comparison result, and calculating the current amount according to the third magnetic flux. 4. The proximity current sensing device according to claim 1, further comprising: a third adjusting element, arranged on a third side of the body, for adjusting a third position of the wire; a fourth adjusting element, configured on a fourth side of the body, for adjusting a fourth position of the wire; and a fourth sensing unit, disposed on the body and adjacent to a fourth side of the wire, for sensing a fourth magnetic flux of the wire; Wherein, the processing unit is further coupled to the fourth sensing unit for determining another position of the wire according to the third magnetic flux and the fourth magnetic flux. 5. The proximity current sensing device according to claim 4, wherein the processing unit comprises: a second comparison unit, coupled to the first sensing unit and the second sensing unit, for receiving and comparing the first magnetic flux and the second magnetic flux to generate a second comparison result; a third comparison unit, coupled to the third sensing unit and the fourth sensing unit, for receiving and comparing the third magnetic flux and the fourth magnetic flux to generate a third comparison result; and A second calculation unit, coupled to the second comparison unit, the third comparison unit and the third sensing unit, for judging the position of the wire according to the second comparison result, and judging according to the third comparison result Another position of the wire is obtained, and the current amount is calculated according to the third magnetic flux. 6. The proximity current sensing device according to claim 4, wherein the first adjusting element, the second adjusting element, the third adjusting element and the fourth adjusting element respectively comprise: a first ejector pin; and A first knob is connected to the first push rod, and the rotation of the first knob drives the first push rod to produce a reciprocating motion, so that the first push rod penetrates into or withdraws from the body. 7. The proximity current sensing device according to claim 1, further comprising: A first display unit, coupled to the processing unit, is used to display the position of the wire, another position and the amount of current. 8. The proximity current sensing device according to claim 1, wherein the wire is a double-core power wire. 9. The proximity current sensing device according to claim 1, wherein the first adjusting element and the second adjusting element respectively comprise: a second ejector pin; and A second knob is connected to the second push rod, and the knob is rotated to drive the second push rod to produce a reciprocating motion, so that the second push rod penetrates or withdraws from the body. 10. The proximity current sensing device of claim 1, further comprising: A display unit, coupled to the processing unit, is used to display the position of the wire and the amount of current. 11. A proximity current sensing method comprising: sensing a first magnetic flux of a wire by using a first sensing unit, wherein the first sensing unit is adjacent to a first side of the wire; sensing a second magnetic flux of the wire by using a second sensing unit, wherein the second sensing unit is adjacent to a second side of the wire; sensing a third magnetic flux of the wire by using a third sensing unit, wherein the third sensing unit is adjacent to a third side of the wire; determining the position of the wire according to the first magnetic flux and the second magnetic flux; and A current is calculated according to the third magnetic flux. 12. The proximity current sensing method according to claim 11, wherein determining the position of the wire according to the first magnetic flux and the second magnetic flux comprises: comparing the first magnetic flux with the second magnetic flux to generate a first comparison result; and According to the first comparison result, the position of the wire is determined. 13. The proximity current sensing method according to claim 11 , further comprising: sensing a fourth magnetic flux of the wire by using a fourth sensing unit, wherein the fourth sensing unit is adjacent to a fourth side of the wire; and Another position of the wire is determined according to the third magnetic flux and the fourth magnetic flux. 14. The proximity current sensing method according to claim 13, calculating the position of the wire according to the first magnetic flux and the second magnetic flux comprises: comparing the first magnetic flux with the second magnetic flux to generate a second comparison result; and According to the second comparison result, the position of the wire is determined. 15. The proximity current sensing method according to claim 13, determining another position of the wire according to the third magnetic flux and the fourth magnetic flux comprises: comparing the third magnetic flux with the fourth magnetic flux to generate a third comparison result; and According to the third comparison result, another position of the wire is determined. 16. The proximity current sensing method of claim 13, further comprising: Displays the position of the wire, the other position and the amount of current. 17. The proximity current sensing method of claim 11 , further comprising: Displays the position of the wire and the amount of current.

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